GNU bug report logs - #51309
28.0.60; [Feature Request] Allow to customize tab-bar button images

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.60; [Feature Request] Allow to customize tab-bar button images
Date: Wed, 20 Oct 2021 19:03:01 -0300

[Message part 1 (text/plain, inline)]

Hi all,

as you can see in the attached images, the xpm files provided for
tab-bar buttons don't look very well in many cases:

1. They are low resolution so they are scaled x 2 in HiDPI screens
(when there is support for this, I guess for other users they look
tiny instead).
2. The light background is particularly ugly (at least IMO) with dark
themes and, in general, I believe the ability to blend the button
background with the default background would be appreciated by a
number of users.
3. Vertical alignment looks slightly off center.

In tab-bar.el I see code like this:

    (add-text-properties 0 (length tab-bar-close-button)
                         `(display (image :type xpm
                                          :file "tabs/close.xpm"
                                          :margin ,tab-bar-button-margin
                                          :ascent center))
                         tab-bar-close-button))

Maybe "tabs/close.xpm" is already intended to be an abstract
specification of an xpm that is then loaded as described in [1]:

> If file is not an absolute file name, it is expanded relative to the images subdirectory of data-directory

so that each theme has to locally, temporally(, whatever) override
data-directory somehow, but I believe it's not like that, I believe
icons are simply hardcoded.

Given the shortcomings listed above, why not provide some customizable
variables to change the icons?

Best regards,
Carlos

[1] https://www.gnu.org/software/emacs/manual/html_node/elisp/Image-Descriptors.html

---

In GNU Emacs 28.0.60 (build 3, x86_64-apple-darwin20.6.0, NS
appkit-2022.60 Version 11.6 (Build 20G165))
 of 2021-10-18 built on Carloss-MacBook-Pro.local
Repository revision: f5b8f626e3d7233a935e67ffc5ffee0de9069ae5
Repository branch: emacs-28
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.6

Configured using:
 'configure --without-native-compilation'

Configured features:
ACL DBUS GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY KQUEUE
NS PDUMPER PNG RSVG THREADS TIFF TOOLKIT_SCROLL_BARS XIM ZLIB

Important settings:
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Major mode: ELisp/l

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Memory information:
((conses 16 505641 67097)
 (symbols 48 34594 2)
 (strings 32 125591 5105)
 (string-bytes 1 4329451)
 (vectors 16 60750)
 (vector-slots 8 807482 36542)
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[image.png (image/png, attachment)]

[image.png (image/png, attachment)]

[image.png (image/png, attachment)]

Message #8 received at 51309 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Carlos Pita <carlosjosepita2 <at> gmail.com>
Cc: 51309 <at> debbugs.gnu.org
Subject: Re: bug#51309: 28.0.60; [Feature Request] Allow to customize
 tab-bar button images
Date: Thu, 21 Oct 2021 19:46:13 +0300

> as you can see in the attached images, the xpm files provided for
> tab-bar buttons don't look very well in many cases:
>
> 1. They are low resolution so they are scaled x 2 in HiDPI screens
> (when there is support for this, I guess for other users they look
> tiny instead).
> 2. The light background is particularly ugly (at least IMO) with dark
> themes and, in general, I believe the ability to blend the button
> background with the default background would be appreciated by a
> number of users.
> 3. Vertical alignment looks slightly off center.

They look sufficiently well but there is always room for improvement.
All suggestions are welcome.

> Maybe "tabs/close.xpm" is already intended to be an abstract
> specification of an xpm that is then loaded as described in [1]:
>
>> If file is not an absolute file name, it is expanded relative to the
>> images subdirectory of data-directory
>
> so that each theme has to locally, temporally(, whatever) override
> data-directory somehow, but I believe it's not like that, I believe
> icons are simply hardcoded.
>
> Given the shortcomings listed above, why not provide some customizable
> variables to change the icons?

This definitely should be customizable, but it's unclear what do you
want to customize: only the file path to the image, or allow to set
the button propertized with an image with image properties like
:margin/:ascent?

Could you send such a button string with an image that looks good
on HiDPI screens?  Then we could try to make a customizable option
based on your design.

Message #11 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Carlos Pita <carlosjosepita2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: 28.0.60;
 [Feature Request] Allow to customize tab-bar button images
Date: Thu, 21 Oct 2021 17:30:51 -0300

Hi Juri,

> This definitely should be customizable, but it's unclear what do you
> want to customize: only the file path to the image, or allow to set
> the button propertized with an image with image properties like
> :margin/:ascent?

Probably the entire (image ...) descriptor. So it's possible to use svg
images (with rsvg enabled which now is the
default) that will work fine at any resolution. Also, even if the images
are correctly centered, they look vertically misaligned wrt text, this
is pretty common and tweaking the ascent may help, I guess.

And perhaps setting a nil descriptor should be allowed as a way to
disable the image altogether.

> Could you send such a button string with an image that looks good
> on HiDPI screens?  Then we could try to make a customizable option
> based on your design.

Vectorized images will do it. Otherwise you will have to provide pixmaps
at twice the resolution and, anyway, with fractional scaling they might
end up being blurry again (although not so much as when scaling up
x2). I assume there are not many devices with higher scaling factors
running emacs out there, yet...

There are plenty of free svg icons for light and dark themes here:
https://github.com/microsoft/vscode-icons/tree/main/icons.

Best regards,
Carlos

Message #14 received at 51309 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Carlos Pita <carlosjosepita2 <at> gmail.com>
Cc: 51309 <at> debbugs.gnu.org
Subject: Re: bug#51309: 28.0.60; [Feature Request] Allow to customize
 tab-bar button images
Date: Fri, 22 Oct 2021 10:01:58 +0300

>> Could you send such a button string with an image that looks good
>> on HiDPI screens?  Then we could try to make a customizable option
>> based on your design.
>
> Vectorized images will do it. Otherwise you will have to provide pixmaps
> at twice the resolution and, anyway, with fractional scaling they might
> end up being blurry again (although not so much as when scaling up
> x2). I assume there are not many devices with higher scaling factors
> running emacs out there, yet...

Some time ago we tried to use svg, but it had many problems with scaling
and background.  Maybe this is fixed now, need to try again.

Message #19 received at 51309 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Carlos Pita <carlosjosepita2 <at> gmail.com>
Cc: 51309 <at> debbugs.gnu.org
Subject: Re: bug#51309: 28.0.60; [Feature Request] Allow to customize
 tab-bar button images
Date: Mon, 24 Oct 2022 10:34:27 +0300

close 51309 29.0.50
thanks

> Given the shortcomings listed above, why not provide some customizable
> variables to change the icons?

Now tab-bar button images are customizable with the new command
'customize-icon'.

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